CP Violation in Fourth Generation Quark Decays

TL;DR

This paper discusses the potential to observe and measure CP violation in fourth-generation quark decays at collider experiments, highlighting significant asymmetries and the feasibility of extracting CPV phases.

Contribution

It proposes a method to study CP violation in b' decays if a fourth generation quark is discovered, with detailed predictions of asymmetries and branching ratios.

Findings

Asymmetries could reach 30-50% in certain decays.

Branching ratios are between 10^{-3} and 10^{-5}.

CPV phases can be extracted with minimal theoretical uncertainty.

Abstract

We show that, if a fourth generation is discovered at the Tevatron or LHC, one could study CP violation in b' \to s decays. Asymmetries could reach 30% for b'\to sZ for m_{b'} \lesssim 350 GeV, while it could be greater than 50% for b'\to s\gamma and extend to higher m_{b'}. Branching ratios are 10^{-3}--10^{-5}, and CPV measurement requires tagging. Once measured, however, the CPV phase can be extracted with little theoretical uncertainty.